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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9b20cea3084dbefe21195f2d23fb058fba857006f12f943a6b435be3a663692' 
  AND token = 'xA2Zb8QW01uguuOpWMMkNF3mfuyvxs7G/JROosFi5m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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