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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73f424a2991f731eb3be3fc56760c8ec44839f6c0eee904ad1ba5d97f675cea8' 
  AND token = 'p5ICsV80kfczCct3Q4m76oheVgMfpqnLa4yj8d2jAoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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