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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df4617142d0d47bd28c3b1e2b17c4ae14624b0c9890c562a308fbdf930950a52' 
  AND token = 'cO/G5d88Cg+2ZJ7uEl0PR9BUZadwo1+XT+Im5jG7RaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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