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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2e19878bddf1349741a865eaaa0fff170ccb3fd8ff09a3649abb486859ce0b' 
  AND token = 'aR+CTwAymKLiZmL8TYe4jReYGp7soKg/TduSdt/BrcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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