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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eda0500ef1c2bc66e730cabbef72f3d6f59ae9cc06e9604a3b3b71d72868c2ff' 
  AND token = 'QheS9NsEpllyb6iZRLtkPxmaqxP/8nJ17G8fEpInzww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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