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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c754af1654641dce8bed43e9b427311c2180ee4a30bef8ecd9778e03e109803e' 
  AND token = '42aPNEeApWwIST0t3/mTerIAkAolXNHsdRRN477SWgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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