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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82970580ee7849c8cc69598db24c124aefae202643b8b9fd9f21a2bacf766d41' 
  AND token = 'TvvXC2rj7s0qM9r1Ht+E9C0lyRmZ4xI3vMF0SOAQ3Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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