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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4392cac87e4a116ff3a0dfd8715c793e3a66c87042c98c867989c72e19c2647f' 
  AND token = 'EadaoRERoRug2E8U4GtiHGf+Rl15eUqMmIO14Wn+WO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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