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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0044772efc92b9f3769bce6705dc9cf4f10ac3e0e413971a9f973f6633682c2' 
  AND token = 'LD2iq862dZA7tLyXr3RcO4xgJK4XZRCGJfJMfXKxVls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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