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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60e6498e3730b685be32054472ff3a309e7f9c867cdbc639caa7cb0084d67487' 
  AND token = 'naLQD92KvjMBzQuL2OXulqXz5eb5DAKwoNR99IsE9KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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