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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dda51d1234c1da1587863290a4fe5c4f4c972ea3d7de885d9910f38129f296ad' 
  AND token = 'R9xdcuknZFjhdM8t91zkx5Iil9xbWUAK23l8qmSdGKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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