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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '011fcd57ae8254f5c828003c7104953d32c6c01bf2370aa6729d7396dc17682e' 
  AND token = 'iMvWzJE4nIhljP7sikPDf9KcslFzzw9w1m2a1KQJUIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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