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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85bd882149a2850e6715e2d109d1ad1d528e23af0a7dda130d2047a43e3b5c2a' 
  AND token = 'fhmqQuc1gfako+rNrZ21QaYke26p17tc8XfP4qNuKTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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