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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39f63b0e53956658152625d45b4cb227cf660230ffdc1948ddce8f82caa223bf' 
  AND token = '5kqwFBpqNPNxLzX5QSQDGWonQoEM5qZbTOa/9PFLsbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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