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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a13e498481e2ad883b1b5a2e90f9621e2d411d1b066bb8f093a68deb2a48137' 
  AND token = 'x7qoT24p0MWhGlEBotLBWAmKQqSHRJbWfWjN9rPkhvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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