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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5007fa2a921677dd5da62d4acab1e12e0edbb4ac5ffa2ad599b76b7e5d13b000' 
  AND token = '0MhSqam336Not+f86NOZFemT2triVQ4qPKylqpALUZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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