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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbe26e79cfd2e3f5767b3bf062da2bee4f957fa4494315cab66725a49372d607' 
  AND token = 'hlgo21G3VdXAjknKzDfCw4ato359toUqXFiDs0Q64jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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