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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f0ccecb2a8cf05bb8a7b86002ea34fa0d8f6cdea09d9acdcde155088b9e9be' 
  AND token = 'ZtfU+45rwe6H4hT3NmhwFd9p5ZZI09dGYnImkqbN8zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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