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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e6c33d7a5d853e09f2ab4c135e8e3ff07e7adb9ee06a4c06bf00b299c364a9d' 
  AND token = '+Fjk+c6Vw+6YW3shBycdgwfa40UIct+E9gFL91qyA9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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