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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5894398b6aab875e8eb01a1f808c2a62a924bbe965261b8be493d22c21642c58' 
  AND token = '86or4HK/G6yQts6rlpFEkWNk8EbYSc5rcKGvv9QTokE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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