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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '869059475a5e9a2cd9559f65586083fda9b0c41b14a56cd149ec957a0827bf66' 
  AND token = 'RaFAbNrtLMRrbcOIlz0LkCHKoRopOYk9Fnj4D83wksA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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