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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39aca9864f1d24ca3e5b9123bcf7ae28e3abc57fd5909373ee7111e223f5d10e' 
  AND token = 'mHQJByniY4YZUjVwNHcQMd3MXiX4S+1+nJ8biLEP7L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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