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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcd7da5aa2ff76b5d817dd8c6e158e90bbba377d0ed93bfb0a37197ba789bd94' 
  AND token = '/o3ZxkhSzfTZaLznuIPt+TwMDsv9gtjr6so1eFWreLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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