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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '307d34df9f5e4a64952ab00af327ac45a7499b1ab2580314ea1d764bbf0bce0c' 
  AND token = '9+N5FutM2SsU0BxCTWaOn9hFU0UZ5utU1E1k10w8wpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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