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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27a5295368be8fb8dd99c6d36246c98db1a5083316f56b7343b7e42334c87374' 
  AND token = 'exceXUtOddUcp4GdlkF50v6w5XDfdHJarWiSnDw1OtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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