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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eb79887d1498b55a9450241b28f7485c1f890b07cfee9e82afb70e94a1a76a5' 
  AND token = 'qpKAMRe6VoW6QxlVaQ9JrNGvXWzanl2NhofF5/ZYLSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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