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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55fafcc5f0a796481eb26ff634029fd9ee17e75bd72419bd2cf45fcce574881e' 
  AND token = 'wFYDT+bMpaP2iv87+nRoN0+wG+ikGrdy/v1ePT4thNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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