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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b8949440fb91bae4695dbf1123bbe1ba1168bd99163eb8dc380dd0714868e2a' 
  AND token = '56mY93eDbvztxpzSETSQncKqMk8FqfmrrbR8WIswQto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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