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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4862719ae67f18ec79f88793f90ed38ac45ad54ba0c5a554b0bcb1d544f0df26' 
  AND token = '14vWE4B5iAsqJmtT0nJpTNPDaK8WBzNVodY7Da4XAFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}