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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdf00ebcd3e7246d6e7a02b4d74978c4c49eaaa6a16f7a7a223e6eb26fd49693' 
  AND token = 'pN3kdiiZ2HK7otRU9SXrurJQVY/TMJuV2JdV7w5ULIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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