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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2157002d16d1a8be89fc41fac0917297b77b42ff3751303e212be97fd34ea61f' 
  AND token = 'KVI1ULEjK9UarUFxKWBCHbZt05tb/LACJN7KraZ5iyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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