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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbc13afdd6306c6edac84e3396ae1ed70a8843881fbbf33b2b64f84427b4040e' 
  AND token = 'rP3UamBlYe/0Vy6trzYO6bNu75a6u+v6mNuCfMX/KyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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