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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '797fe8763ad97296af405434836ffc1c58678782e4fa21c533e53fb7ace160af' 
  AND token = '5ohpbnQ1r/3BCZoXykWFuv7JDtNoAcUbEWtxB0bNUVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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