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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee1d03e9581a41e8b0cc2d9125045c43cf6f63378dc97755942f7f96f0d2b6f1' 
  AND token = 'j8SowsSMn+kl+AG/4puQxbK7WiFziTWWR4lHSlrASBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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