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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca15020b68931fb2fd395bd3b0ed2d4dc7ba26decac035f3b32125787743876' 
  AND token = 'w4g93ZNRdgl1G7LnhnZKMbO9Ps4trRtLz8tnoawqWrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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