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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bca1d4eb3464e595b2af1da564a32cef435a608e79044ce35e6712a190b564e4' 
  AND token = 'lihUNjawwS9kLycFM/FFpj9rOkWxsBTjzDGCUmS+QQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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