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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '112fe2d3ad375481cd4d04aede9f3324f7a1d496af1c6ebeebd526f16e850de5' 
  AND token = 'MejpAXU3sMNS3pCj1k1dlWARX1Ecrp40Br/P5ydP8QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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