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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69c32fd2b8f799da6ea0a1fba3e31259e863e478774b4f3bbde740d1fceab497' 
  AND token = 'rj/eri/2lUS18SxRpW/kecNFxQ/4RL++vU11tEXBKKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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