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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eec1c14819c5b1059a51960f695d2d4ad2b0f22c0bf5c7eb1aaf9e649a379e9f' 
  AND token = 'DwFekWcCobWbkqIuh/tA7Z2+KLvD/ILkERg4Xvpq4lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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