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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd0bf880dfe1ad37c5a9f69bf656ca31e81c2a7881fa3a34b9c9775b930e404d' 
  AND token = 'XrOWBXueClECO07g78LTROu3sm9WSj7uSZfvSvqh8IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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