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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f0f91cdebbc99edf4dc05663d3630679f2be99b0c2f4cc4b5485147e6cd4b8d' 
  AND token = 'T9sGyKbZPtfOLDkaI67s1xBkmHflQBZGDOFHpEBAf4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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