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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e6bee03335be5350188417e092decf0e8348c9fc8a038a1f570e47e2ab29aa' 
  AND token = '9lSi3w20OI1uaBjux3D9jZ9H3NJMq34x8ukJzamyV/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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