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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a822c629961833eb89c21dc805eed72656a21ea09dd3eabb182dccaeff531d98' 
  AND token = 'buTdHsoknepsy/yI5iNa2JLv7yWKoO3j7x4/FOkT7AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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