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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daeaaafdb70b4c7a663f8818dfa3caa83c3ce54999d4c6aeba8240abd477130c' 
  AND token = 'zlhvrBEus/OGlvM4xOcWsuhBkmrw3Pvf4D3WHDSXIiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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