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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd60d937a0072727a4864aaa4ce446839c8dad6fb75026e70a1a5c8699adf9790' 
  AND token = 'BN4pwagR42MYjWf2C/AjV1aE3zHJ6Lx4KfiJQpPisqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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